Scribing device



Feb. 11, 1969 B. SHEER SCRIBING DEVICE Sheet Filed Dec. 5. 1967 FIG] FIG.4

INVENTOR. Benjamin Sheer FIG.5

ATTORNEY Feb. 11, 1969 B SHEER SCRIBING DEVICE Sheet F'iled Dec. 5, 1967 Unite rates 3,426,432 SCRIBING DEVICE Benjamin Sheer, 61 Horatio St., New York, N.Y 10014 Filed Dec. 5, 1967, Ser. No. 688,040 US. CI. 33-41 11 Claims Int Cl. B43] 13/02 ABSTRACT OF THE DISCLOSURE Background of the invention Stencil knives having parallel blades are well known in the art. However, the blades of suchknown devices are in fixed relation to each other or may be adjusted to vary the spacing therebetween. However, in either case, the cutting edges of the blades'lie in a fixed common horizontal plane.

In the manipulation of stencil knives, any tilt of the device will cause a lifting of one of the blades from the work, leaving uncutportions of the work. Further, with such fixed blade knives, sensitivity in manipulation of the knife in the hands of the user is markedly reduced.

Accordingly, an object of this invention is to provide an improved scribing device having a pair of scribing elements for formng parallel cuts or markings; wherein the scribing elements are mounted in a holder in freely slidable, floating relation to each other thereby allowing the device to be tilted to various angles during use, yet leaving both scribing elements in contact with the work at all times.

Another object of this invention is to provide a device of the character described. which is of relatively simple construction, comprises a minimum number of parts, and is' economical to manufacture.

Other objects of this invention are in part obvious and in part hereinafter pointed out.

Brief description of the drawing FIG. 1 is a longitudinal section of a scribing device.

Description of the preferred embodiment As shown in the drawings, designates a scribing device embodying the invention. The same comprises an elongated tubular barrel member 11 for slidably mounting therein a pair of elongated similar scribing elements 12. Scribing elements 12 may function as cutting means and accordinglyterminate in sharp cutting points 13.

The barrel member 11 is open at one end 14 and is externally thrcadedas at 15 to receive thereon a collar member 16 which is internally threaded as at 17 to screw on threaded portion 15 of barrel member 11. Collar 16 is formed with an annular shouldered portion 18 at the forward end thereof to hold several spacer members 19A 3,426,432 Patented Feb. 11, 1969 leaving circumferential spaces 19 therebetween for receiving ball bearings 20 which abut the grooved periphery 21 of a rotatable disc 22. Disc 22 is formed with diametrically located spaced openings 23, 24 for the purpose later described. An externally threaded retaining ring 25 is screwed into the internally threaded portion 26 of collar 16 to keep ball bearings 20 and rotatable disc 22 in place.

The scribing elements 12 are disposed in floating relation to each other within barrel 1!. To this end there is provided an annular abutment plate 27 which is formed on its forward face with an annular groove 28 extending about a frusto-conical projection 29; and on its rear'face with an axially located conical recess 30. Plate 27 is rotatably and rockably related to a fulcrum member 31 having a forwardly projecting conical fulcrum point 32 which is received in plate recess 30.

The conical recess subtends an angle somewhat greater than that included in conical fulcrum point 32, whereby abutment plate 27 may be rotated and rocked relative to fulcrum point 32. The rear end portions 12A of the scribing elements 12 are suitably rounded and received in the annular groove 28 of plate 27 for accommodating movement therein as plate 27 is rotated and rocked.

The elements 12, the abutment plate 27 and fulcrum member 31 are retained in assembled relation by a magnet 33 located within barrel member 11 and held in a holder member 34. The fulcrum member 31, abutment plate 27 and scribing elements 12 are formed of magnetizable material such as steel or suitable magnetic alloys, thereby enabling magnet 33 to hold the same in assembled relation, yet permitting rocking and rotary movement of abutment plate 27.

Preferably, magnet holder member 34 is arranged for movement to adjusted longitudinal positions and to this end, holder member 34 is affixed to the forward end of a stem 35 which extends axially of barrel member 11, with a threaded rear portion 36 passing through a threaded opening 37 in the rear wall 38 of the barrel member 11. A head 39 on the outwardly projecting portion of the stem 35 allows for advance or retraction of the scribing elements 12, as desired.

It is understood that scribing elements 12 may be rotated as a unit, during use, by way of the rotatable disc 22 and rotatable abutment plate 27. However, elements 12 are kept in a common plane during rotation, by a pair of plates 40 held in parallel relation by centrally located cross members 41 which are in tubular form and have ball bearings 42 rotatably mounted in the outer ends thereof. The spacing of plates 40 is sufficient to freely pass elements 12 therebetween and the ball bearings 42 have rolling engagement with the opposed inner surface portions 11A of barrel member 11. l The scribing elements 12 may have varied spacings therebetween, by mounting the same in selected pairs of openings 23 or 24 in plate 22, thus allowing cutting or marking lines formed with device 10 to have a desired width. It will be apparent, that in using device 10, the scribing elements 12 will accommodate themselves to substantially any position of the device as the same is being manipulated by the user. In particular, in cutting or marking curves, one element 12 may be foreshortened as the other is simultaneously lengthened in effect; the abutment plate 27 providing facile means for locating said scribing elements in adjusted longitudinal relation to each other.

When it is desired to cut or mark parallel lines having a spacing greater than that provided by the outermost openings 23 or 24; modified forms of the scribing elements may be used, as shown in FIG. 6. Here, scribing elements 128 are similar to elements 12, except that the terminal portions are offset, including horizontally bent portions 45 and depending vertical portions 46 terminating in points 13A.

A yoke member 47 is provided for maintaining ele ments 128 in selected spacings therebetween. Member 47 comprises a vertical portion 48 formed with curled tubular portions 49 for slidably passing elements 12B. A semidevice is then used in the manner previously described.

It is understood that elements 12, 128 may terminate in marking means rather than cutting points 13, as for example lead or ink holding attachments for the lower ends of said elements 12, 128.

The spacing between elements 12 may be precisely adjusted by turning head 39 to advance or retract magnet holder 34 and thereby varying the angularity of said elements as they, are advanced or retracted.

The plates 40 and connecting members 41 are formed of non-magnetizable material.

As various changes might be made in the herein disclosed embodiments of the invention without departing from the spirit thereof, it is understood that all matter herein shown or described shall be deemed illustrative and not by way of limitation except as set forth in the appended claims.

What is claimed is:

1. A scribing device comprising a barrel member open at one end, a pair of elongated scribing elements slidably disposed within said barrel member with the forward ends of said elements projecting from the open end of said barrel member, means for maintaining said elements in laterally spaced relation, means for retaining said elements within said barrelmember, and means for slidably moving one of said elements in one direction in response to slidable movement of the other element in the opposite direction.

2. A device as in claim Lwherein said element spacing means comprises a disc meinber formed with a plurality of spaced openings therein for passing said pair of elementsthrough a selected pair of said openings.

3. A device as in claim 1 wherein said last mentioned 'means comprises a movable abutment member within said barrel member, fulcrum means within said barrel member for mounting said abutment member for formed with a conical recess for receiving the apex portion of said conical member, said .recess subtending an angle greater than the angle subtended by the apex portaining said scribing elements in laterally spaced relation as said pair of elements rotate about the longitudinal axis of said barrel.

8. A device as in claim 7 wherein said last mentioned means comprises a pair of opposed members in fixed spaced relation to each other and located between said disc member and said element moving means, said scribing elements being located between said opposed members, said pair of opposed members having side edge portions thereof adjacent and slidably engaged with inner surface portions of said barrel member.

9. A device as in claim Sand further including means for adjusting the longitudinal position of said magnet member within said barrel member to thereby adjust the position of said scribing elements relative to said disc member.

10. A device as in claim 2 wherein said elements comprise terminal portions in ofiset relation to the upper portions thereof, said offset portions being located in forwardly projecting relation to said disc member, and means engageable with said otiset terminal portions of the scribing elements for selectively maintaining said terminal portions at a predetermined spacing therebetween.

11; A device as in claim 10 wherein the oflset portions of said scribing elements comprise horizontally disposed portions, and said last mentioned means comprises a yoke member having an upstanding portion including passage means for slidably passing portions of said elements above the oflfset portions thereof, a horizontal wall extending from thelower end of said upstanding portion and arcuate skirt portiondepending from an-outer edge of said horizontal portion, said skirt portion being formed with circumferentially spaced, downwardly opening notches for passing the horizontal portions of the oflfset portions of said elements.

References Cited UNITED STATES PATENTS 1,731,395 10/1929 Radt-ke. 2,680,296 6/1954 Cronberger.

FOREIGN PATENTS HARRY N. HAROIAN, Primary Examiner. 

